Update: You can now purchase my most recent version of this design (after years and dozens more iterations) from Amazon: mello for Magic Mouse (this is an affiliate link and an advertisement).

Attachment for the Apple Magic Mouse*.

The magic mouse is the only one I've used on the mac that implements touch scrolling decently, but I found I couldn't use it for more than 10 or 15 minutes without wrist discomfort. If you have the same issue, you may want to give this a try.

*affiliate link

I print these without support material, with a lot of part cooling, and attached to the build plate with a glue stick. But other settings may work better with other printers.

The layer ridges from the printer will tend to trap dirt. Printing in a darker color, sanding, or using acetone vapor smoothing will help. The part in the picture was printed in PET, sanded, and coated with woodwax